Mergers from April 1, 1999 to Present

• On March 1, 2004 - the towns of Izuhara, Mitsushima, Toyotama from Shimoagata District, and the towns of Mine, Kamiagata and Kamitsushima from Kamiagata District merged to form the city of Tsushima
  Tsushima, Nagasaki
  is a city governed by Nagasaki Prefecture, Japan. It is the only city of Tsushima Subprefecture and it encompasses all of Tsushima Island Archipelago, which lies in the Tsushima Strait north of Nagasaki on the western side of Kyūshū, the southernmost mainland island of Japan. the city has an...
  
  . Shimoagata District and Kamiagata District were dissolved due to this merger.

• On March 1, 2004 - the towns of Gonoura, Katsumoto, Ashibe and Ishida from Iki District merged to form the city of Iki
  Iki, Nagasaki
  is a city located at Iki Island in Nagasaki, Japan. It is located approximately 80 kilometers northeast of Fukuoka on mainland Kyūshū. The city consists of five inhabited and 17 uninhabited islands, and its entire area is within the Iki-Tsushima Quasi-National Park...
  
  . Iki District was dissolved due to this merger.

• On August 1, 2004 - the city of Fukue
  Fukue, Nagasaki
  was a city located in the Gotō Islands of Nagasaki, Japan. It was the largest city on the Gotō Islands.As of 2003, the city had an estimated population of 26,886 and the density of 170.01 persons per km²...
  
   and the towns of Tomie, Tamanoura, Miiraku, Kishiku and Naru (all from Minamimatsuura District) merged to form the city of Gotō
  Goto, Nagasaki
  is a city in Nagasaki Prefecture, Japan. It comprises the south-west half of the Gotō Islands in the East China Sea, some 100 kilometers from Nagasaki. The city consists of 11 inhabited and 52 uninhabited islands...
  
  .

• On August 1, 2004 - the towns of Wakamatsu, Kamigotō, Shin'uonome, Arikawa and Narao (all from Minamimatsuura District) merged to form the town of Shinkamigotō
  Shinkamigoto, Nagasaki
  is a town located in Minamimatsuura District, Nagasaki, Japan.The town was established on August 1, 2004 after the merger of the towns of Arikawa, Kamigotō, Narao, Shin'uonome and Wakamatsu, all from Minamimatsuura District...
  
  .

• On January 4, 2005 - the towns of Kōyagi
  Koyagi, Nagasaki
  was a town, currently part of Nagasaki City, Japan. Situated approximately 13 km south of the centre of Nagasaki City, the town is notable for the Mistubishi shipyard which occupies 60% of urban areas....
  
  , Iōjima, Takashima
  Takashima, Nagasaki (Nishisonogi)
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 791 and a density of 590.30 people per km²...
  
  , Nomozaki
  Nomozaki, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 7,528 and a density of 359.68 persons per km²...
  
  , Sanwa
  Sanwa, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 11,883 and a population density of 546.60 persons per km²...
  
   and Sotome
  Sotome, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 5,412 and a density of 116.09 persons per km²...
  
   (all from Nishisonogi District
  Nishisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 72,238 and a density of 1460 persons per km²...
  
  ), merged into the city of Nagasaki.

• On March 1, 2005 - the city of Isahaya
  Isahaya, Nagasaki
  is a city located in Nagasaki Prefecture, Japan.The city was founded on September 1, 1940. On March 1, 2005, the city expanded through a merger with the surrounding towns of Tarami, Moriyama, Iimori, Takaki and Konagai merged to form the new city of Isahaya...
  
  , the town of Tarami
  Tarami, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 16,995 and a density of 448.65 persons per km². The total area was 37.88 km²....
  
   from Nishisonogi District
  Nishisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 72,238 and a density of 1460 persons per km²...
  
  , and the towns of Moriyama
  Moriyama, Nagasaki
  was a town located in Kitatakaki District, Nagasaki, Japan.As of 2003, the town had an estimated population of 6,154 and a density of 264.57 persons per km²...
  
  , Iimori
  Iimori, Nagasaki
  was a town located in Kitatakaki District, Nagasaki, Japan.As of 2003, the town had an estimated population of 7,979 and a density of 321.35 persons per km²...
  
  , Takaki
  Takaki, Nagasaki
  was a town located in Kitatakaki District, Nagasaki, Japan.As of 2003, the town had an estimated population of 10,912 and a density of 219.16 persons per km²...
  
   and Konagai
  Konagai, Nagasaki
  was a town located in Kitatakaki District, Nagasaki, Japan.As of 2003, the town had an estimated population of 6,437 and a density of 208.12 persons per km²...
  
   from Kitatakaki District
  Kitatakaki District, Nagasaki
  was a district located in Nagasaki, Japan.On January 4, 2005 all towns from this district merged with the City of Isahaya to form the new City of Isahaya. The District of Kitatakaki was dissolved due to this merger....
  
   merged to form the new city of Isahaya
  Isahaya, Nagasaki
  is a city located in Nagasaki Prefecture, Japan.The city was founded on September 1, 1940. On March 1, 2005, the city expanded through a merger with the surrounding towns of Tarami, Moriyama, Iimori, Takaki and Konagai merged to form the new city of Isahaya...
  
  . Kitatakaki District
  Kitatakaki District, Nagasaki
  was a district located in Nagasaki, Japan.On January 4, 2005 all towns from this district merged with the City of Isahaya to form the new City of Isahaya. The District of Kitatakaki was dissolved due to this merger....
  
   was dissolved due to this merger.

• On April 1, 2005 - the towns of Saikai
  Saikai, Nagasaki
  is a city located in Nagasaki, Japan.Saikai City was formed through the merger of five towns on the northern tip of Nishisonogi Peninsula on April 1, 2005: the former town of Saikai, Ōseto, Ōshima, Sakito and Seihi, all from Nishisonogi District...
  
  , Seihi
  Seihi, Nagasaki
  was a town located in Nishisonogi District, Nagasaki Prefecture, Japan.On April 1, 2005 Seihi was merged with the towns of Saikai , Ōseto, Ōshima and Sakito, all from Nishisonogi District, to form the new city of Saikai.-Geography:...
  
  , Ōshima
  Oshima, Nagasaki (Nishisonogi)
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 6,046 and a density of 453.56 persons per km². The total area was 13.33 km²....
  
  , Sakito
  Sakito, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 2,126 and a density of 150.57 persons per km². The total area was 14.12 km²....
  
   and Ōseto
  Oseto, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.As of 2003, the town had an estimated population of 7,577 and a density of 96.25 persons per km². The total area was 78.72 km²....
  
   from Nishisonogi District
  Nishisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 72,238 and a density of 1460 persons per km²...
  
   merged to form the city of Saikai
  Saikai, Nagasaki
  is a city located in Nagasaki, Japan.Saikai City was formed through the merger of five towns on the northern tip of Nishisonogi Peninsula on April 1, 2005: the former town of Saikai, Ōseto, Ōshima, Sakito and Seihi, all from Nishisonogi District...
  
  .

• On April 1, 2005 - the towns of Yoshii
  Yoshii, Nagasaki
  Yoshii was a town located in Kitamatsuura District, Nagasaki, Japan.On April 1, 2005 Yoshii, along with the town of Sechibaru, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   and Sechibaru
  Sechibaru, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On April 1, 2005 Sechibaru, along with the town of Yoshii, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   from Kitamatsuura District
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
   merged into the city of Sasebo
  Sasebo, Nagasaki
  is a city located in Nagasaki Prefecture, Japan. As of 2011, the city has an estimated population of 259,800 and the density of 609 persons per km². The total area is 426.47 km². The locality is famed for its scenic beauty. The city includes a part of Saikai National Park...
  
  .

• On October 1, 2005 - city of Hirado
  Hirado, Nagasaki
  is a city in Nagasaki Prefecture, Japan. The part historically named Hirado is located on the island of the same name. With recent mergers, the city's boundaries have expanded, and Hirado now occupies parts of the main island of Kyūshū...
  
   and the towns of Ikitsuki
  Ikitsuki, Nagasaki
  is a former town on the island of the same name located in Kitamatsuura District, Nagasaki, Japan.On October 1, 2005 Ikitsuki, along with the town of Tabira, and the village of Ōshima, both from Kitamatsuura District, was merged into the expanded city of Hirado....
  
   and Tabira
  Tabira, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On October 1, 2005 Tabira, along with the town of Ikitsuki, and the village of Ōshima, both from Kitamatsuura District, was merged into the expanded city of Hirado. Its top attraction is Tabira Insect Park.As of 2003, the town had an...
  
   and the village of Ōshima
  Oshima, Nagasaki (Kitamatsuura)
  was a village located on an island in Kitamatsuura District, Nagasaki, Japan.On October 1, 2005 Ōshima, along with the towns of Ikitsuki and Tabira, both from Kitamatsuura District, was merged into the expanded city of Hirado....
  
   (all from Kitamatsuura District
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
  ) merged to form the city of Hirado
  Hirado, Nagasaki
  is a city in Nagasaki Prefecture, Japan. The part historically named Hirado is located on the island of the same name. With recent mergers, the city's boundaries have expanded, and Hirado now occupies parts of the main island of Kyūshū...
  
  .

• On October 11, 2005 - the towns of Aino
  Aino, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On October 11, 2005 Aino was merged with the towns of Azuma, Chijiwa, Kunimi, Minamikushiyama, Mizuho and Obama, all from Minamitakaki District, to form the new city of Unzen....
  
  , Azuma
  Azuma, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On October 11, 2005 Azuma was merged with the towns of Aino, Chijiwa, Kunimi, Minamikushiyama, Mizuho and Obama, all from Minamitakaki District, to form the new city of Unzen....
  
  , Chijiwa, Kunimi
  Kunimi, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On October 11, 2005 Kunimi was merged with the towns of Aino, Azuma, Chijiwa, Minamikushiyama, Mizuho and Obama, all from Minamitakaki District, to form the new city of Unzen....
  
  , Mizuho
  Mizuho, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.As of 2003, the town had an estimated population of 5,884 and a density of 224.07 persons per km². The total area was 26.26 km²....
  
  , Obama
  Obama, Nagasaki
  was the name of a town located in Minamitakaki District, Nagasaki Prefecture, Japan.On October 11, 2005 Obama was merged with the towns of Aino, Azuma, Chijiwa, Kunimi, Minamikushiyama and Mizuho, all from Minamitakaki District, to form the new city of Unzen....
  
   and Minamikushiyama
  Minamikushiyama, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On October 11, 2005 Minamikushiyama was merged with the towns of Aino, Azuma, Chijiwa, Kunimi, Mizuho and Obama, all from Minamitakaki District, to form the new city of Unzen....
  
   (all from Minamitakaki District
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
  ) merged to form the new city of Unzen
  Unzen, Nagasaki
  is a city in Nagasaki Prefecture, Japan, located on the northern tip of Shimabara Peninsula, facing Ariake Bay in the east and Mount Unzen to the south. Unzen city was formed on October 11, 2005 by a merger of the towns of Aino, Azuma, Chidiwa, Kunimi, Minamikushiyama, Mizuho and Obama, all from...
  
  .

• On January 1, 2006 - the town of Ariake
  Ariake, Nagasaki
  ) was a town located in Minamitakaki District, Nagasaki, Japan.On January 1, 2006 Ariake was merged into the city of Shimabara.As of 2003, the town had an estimated population of 11,863 and a density of 505.24 persons per km². The total area was 23.48 km²....
  
   from Minamitakaki District
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
   merged into the city of Shimabara
  Shimabara, Nagasaki
  is a city located on the north-eastern tip of the Shimabara Peninsula, facing Ariake Bay in the east and Mount Unzen in the west, in Nagasaki Prefecture, Kyūshū, Japan.-History:...
  
  .

• On January 1, 2006 - the city of Matsuura
  Matsuura, Nagasaki
  is a city located in Nagasaki, Japan. Matsuura City is bordered on three sides by mountains. Matsuura Bay makes up the fourth side.-History:Mention of a "Matsuura County" appears in written records from the Heian period, and this area was the home of the Matsuura clan, a local warrior clan...
  
   and the towns of Fukushima
  Fukushima, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On January 1, 2006 Fukushima, along with the town of Takashima, also from Kitamatsuura District, was merged into the expanded city of Matsuura....
  
   and Takashima
  Takashima, Nagasaki (Kitamatsuura)
  was a town located in Kitamatsuura District, Nagasaki, Japan.On January 1, 2006 Takashima, along with the town of Fukushima, also from Kitamatsuura District, was merged into the expanded city of Matsuura....
  
   from Kitamatsuura District
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
   merged to form the city of Matsuura
  Matsuura, Nagasaki
  is a city located in Nagasaki, Japan. Matsuura City is bordered on three sides by mountains. Matsuura Bay makes up the fourth side.-History:Mention of a "Matsuura County" appears in written records from the Heian period, and this area was the home of the Matsuura clan, a local warrior clan...
  
  .

• On January 4, 2006 - the town of Kinkai
  Kinkai, Nagasaki
  was a town located in Nishisonogi District, Nagasaki, Japan.On January 4, 2006 Kinkai was merged into the expanded city of Nagasaki.As of 2003, the town had an estimated population of 12,518 and a density of 185.10 persons per km². The total area was 67.63 km²....
  
   from Nishisonogi District
  Nishisonogi District, Nagasaki
  is a district located in Nagasaki, Japan.As of January 1, 2009, the district has an estimated population of 72,238 and a density of 1460 persons per km²...
  
   merged into the city of Nagasaki.

• On March 31, 2006 - the towns of Kosaza
  Kosaza, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On March 1, 2006 Kosaza, along with the town of Uku, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   and Uku
  Uku, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On March 1, 2006 Uku, along with the town of Kosaza, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   from Kitamatsuura District
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
   merged into the city of Sasebo
  Sasebo, Nagasaki
  is a city located in Nagasaki Prefecture, Japan. As of 2011, the city has an estimated population of 259,800 and the density of 609 persons per km². The total area is 426.47 km². The locality is famed for its scenic beauty. The city includes a part of Saikai National Park...
  
  .

• On March 31, 2006 - all towns of Minamitakaki District
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
   (Arie
  Arie, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Arie was merged with the towns of Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Fukae
  Fukae, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Fukae was merged with the towns of Arie, Futsu, Kazusa, Kitaarima, Kuchinotsu, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Futsu
  Futsu, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Futsu was merged with the towns of Arie, Fukae, Kazusa, Kitaarima, Kuchinotsu, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Kazusa
  Kazusa, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Kazusa was merged with the towns of Arie, Fukae, Futsu, Kitaarima, Kuchinotsu, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Kitaarima
  Kitaarima, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Kitaarima was merged with the towns of Arie, Fukae, Futsu, Kazusa, Kuchinotsu, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Kuchinotsu
  Kuchinotsu, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Kuchinotsu was merged with the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Minamiarima and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  , Minamiarima
  Minamiarima, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Minamiarima was merged with the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu and Nishiarie, all from Minamitakaki District, to form the new city of Minamishimabara....
  
   and Nishiarie
  Nishiarie, Nagasaki
  was a town located in Minamitakaki District, Nagasaki, Japan.On March 31, 2006 Nishiarie was merged with the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu and Minamiarima, all from Minamitakaki District, to form the new city of Minamishimabara....
  
  ) merged to form the new city of Minamishimabara
  Minamishimabara, Nagasaki
  is a city in Nagasaki Prefecture, Japan. It occupies the southern tip of Shimabara Peninsula.Minamishimabara city was founded on March 31, 2006 upon the merger of the towns of Arie, Fukae, Futsu, Kazusa, Kitaarima, Kuchinotsu, Minami-Arima and Nishi-Arie, all from Minamitakaki District, which was...
  
  . Minamitakaki District
  Minamitakaki District, Nagasaki
  was a district located in Nagasaki, Japan. The district was dissolved on March 31, 2006.The district was equivalent to the cities of Shimabara, Unzen, and Minamishimabara....
  
   was dissolved with this merger.

• On March 31, 2010 - the towns of Emukae
  Emukae, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On March 31, 2010 Emukae, along with the town of Shikamachi, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   and Shikamachi
  Shikamachi, Nagasaki
  was a town located in Kitamatsuura District, Nagasaki, Japan.On March 31, 2010 Shikamachi, along with the town of Emukae, also from Kitamatsuura District, was merged into the expanded city of Sasebo....
  
   from Kitamatsuura District
  Kitamatsuura District, Nagasaki
  is a district located in Nagasaki, Japan.As of August 1, 2011, the district has an estimated population of 16,270 and a density of 282 persons per km²...
  
   merged into the city of Sasebo
  Sasebo, Nagasaki
  is a city located in Nagasaki Prefecture, Japan. As of 2011, the city has an estimated population of 259,800 and the density of 609 persons per km². The total area is 426.47 km². The locality is famed for its scenic beauty. The city includes a part of Saikai National Park...
  
  .